Carbon nanotube-based SAW sensors
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I Sayago [2] ; M J Fernández [2] ; J L Fontecha [2] ; M C Horrillo [2] ; E Terrado [3] ; A Seral-Ascaso [1] ; E Muñoz [1]
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[1] Instituto de Carboquímica
Instituto de Carboquímica
Zaragoza, España
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[2] CSIC, Madrid
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[3] Universidad de San Jorge
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- Localización: Proceedings of the 2013 Spanish Conference on Electron Devices / Héctor García (aut.), Helena Castán Lanaspa (aut.), 2013, ISBN 9781467346665
- Idioma: español
- Texto completo no disponible (Saber más ...)
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Resumen
Surface acoustic wave (SAW) gas sensors based on the use of carbon nanotube (CNT) networks as sensitive layers have been investigated for the detection of atmospheric gas pollutants: volatile organic compounds (VOCs), NO 2 , CO, and H 2 . SAW sensor configuration consists of a delay line made on a piezoelectric substrate (ST -X cut quartz) and a sensitive layer (CNTs) deposited between the interdigital transducers (IDTs). CNT networks were fabricated by airbrushing single-walled-(SWCNTs) and double-walled- (DWCNTs) CNT dispersions onto quartz substrates. Among all the tested CNT materials and gases, only DWCNT -based SAW sensors were sensitive upon exposure to low concentration of octane and toluene, providing fast response and recovery times to these VOCs.
